Its best-known game series include Tomb Raider, Hitman, Commandos, Deus Ex, Legacy of Kain, Thief, and Fear Effect.
The company was planning to bring out a RISC OS powered games console prior to the collapse of Acorn Computers as a vendor and the sale of the OS to Pace Micro Technology.
The company maintains offices all around the world, including the United States, Germany, France, Australia and Japan.
On August 3, 2004, the Wall Street Journal reported that Eidos was in preliminary discussions with a small number of companies in relation of a possible business combinations. In early March 2005 Eidos admitted that cash reserves had dwindled to £11.9m during the second half of 2004 and pre-tax losses had grown to £29m.
On March 21, 2005 Eidos received a takeover bid from Elevation Partners, the private equity firm owned by former Electronic Arts president John Riccitiello and with a number of notable partners, including U2's lead singer Bono. This takeover valued the company at £71m ($135m), and would inject £23m in order to keep the company solvent in the short term.
On 22 March, Eidos received a second takeover bid from the British games manufacturer SCi Entertainment. SCi offered £74m ($139m), and tabled a restructuring plan to cut £14m from annual costs. To fund this takeover, SCi proposed to sell £60m worth of stock. Eventually, in late April, Elevation Partners formally withdrew its offer, leaving the way clear for SCi. The takeover was finalized on 16 May 2005.
Since the SCi purchase, the vast majority of the old Eidos management have been let go. SCi have left their Battersea Office and moved into the old Eidos office on the second floor of Wimbledon Bridge House, 1 Hartfield Road, Wimbledon. Eidos announced on February 15, 2007 that they will open a new studio in Montreal, Quebec, Canada responsible for "new undisclosed next-generation projects". Eidos Montreal is developing a new game in the Deus Ex franchise.
Ian Livingstone was awarded an OBE (Order of the British Empire) for "Services to the Computer Games Industry" in the New Year Honours List 2006 as was Jane Cavanagh in the New Year Honours List 2007.
On 4 September 2007 the board of SCi Entertainment confirmed recent speculation that the company has been approached with a view to making an offer. On 10 January, 2008 SCi announced take over and/or merger talks had been halted. As a result, the share price dropped by over 50%. Major investors called for the resignation of key personnel, including Jane Cavanagh, over this issue as well as delays to key titles. On January 18, 2008 CEO Jane Cavanagh, Bill Ennis and Rob Murphy left the company.
Eidos' parent company, SCi, revealed its 2008 financial report. Losses were at £100 million, but new CEO Phil Rogers claimed this was only due to the reconstructing plans.
On September 19th 2008 Eidos opened a Shanghai based studio consisting of a small team to build up relations in Asia.